Buggy code:
public class ClassFinder { private static Category catClass = Category . getInstance ( ClassFinder . class . getName ( ) ) ; private ClassFinder ( ) { } public static List findClassesThatExtend ( Class [ ] superClasses ) throws IOException , ClassNotFoundException { } private static String [ ] addJarsInPath ( String [ ] paths ) { } public static List findClassesThatExtend ( Class [ ] superClasses , boolean innerClasses ) throws IOException , ClassNotFoundException { } public static ArrayList findClassesByInterface ( String [ ] strPathsOrJars , Class [ ] interfaces ) throws IOException , ClassNotFoundException { } public static ArrayList findClassesByInterface ( String [ ] strPathsOrJars , Class [ ] interfaces , boolean innerClasses ) throws IOException , ClassNotFoundException { } private static List getClasspathMatches ( String [ ] strPathsOrJars ) { } private static void getAllInterfaces ( Class theClass , Map hInterfaces ) { } private static String [ ] fixDotDirs ( String [ ] paths ) { } private static String fixDotDir ( String path ) { } private static String [ ] fixEndingSlashes ( String [ ] strings ) { } private static String fixEndingSlashes ( String string ) { } private static String [ ] fixSlashes ( String [ ] strings ) { } private static String fixSlashes ( String str ) { } private static String replaceString ( String s , String strToFind , String strToReplace ) { } private static boolean classImplementsInterface ( Class theClass , Class theInterface ) { } private static ArrayList findAllSubclasses ( List listSuperClasses , List listAllClasses ) { } private static ArrayList findAllSubclasses ( List listSuperClasses , List listAllClasses , boolean innerClasses ) { } private static void findAllSubclassesOneClass ( Class theClass , List listAllClasses , List listSubClasses ) { } private static void findAllSubclassesOneClass ( Class theClass , List listAllClasses , List listSubClasses , boolean innerClasses ) { } private static String fixClassName ( String strClassName ) { } private static void findClassesInOnePath ( String strPath , List listClasses ) throws IOException { } private static void findClassesInPaths ( List listPaths , List listClasses ) throws IOException { } private static void findClassesInPathsDir ( String strPathElement , File dir , List listClasses ) throws IOException { } public static class Test extends TestCase { public Test ( String name ) { } public void testFindClassesInPaths ( ) { <START_BUG> String testPath = ( System . getProperty ( "user.dir" ) ) + "//classes" ; <END_BUG> List listPaths = new ArrayList ( ) ; ArrayList listClasses = new ArrayList ( ) ; listPaths . add ( testPath ) ; try { ClassFinder . findClassesInPaths ( listPaths , listClasses ) ; } catch ( IOException e ) { fail ( "IOException<seq2seq4repair_space>thrown" ) ; } Iterator iter = listClasses . iterator ( ) ; if ( iter . hasNext ( ) ) { String fullname = null ; String fileSeparator = System . getProperty ( "file.separator" ) ; String filename = ( ( String ) ( iter . next ( ) ) ) ; filename = filename . replace ( '.' , fileSeparator . charAt ( 0 ) ) ; if ( testPath . endsWith ( fileSeparator ) ) { fullname = ( testPath + filename ) + ".class" ; } else { fullname = ( ( testPath + fileSeparator ) + filename ) + ".class" ; } File file = new File ( fullname ) ; this . assertTrue ( ( fullname + "<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>a<seq2seq4repair_space>file" ) , file . isFile ( ) ) ; } else { fail ( ( testPath + "<seq2seq4repair_space>is<seq2seq4repair_space>empty.<seq2seq4repair_space>Please<seq2seq4repair_space>choose<seq2seq4repair_space>a<seq2seq4repair_space>path<seq2seq4repair_space>which<seq2seq4repair_space>has<seq2seq4repair_space>at<seq2seq4repair_space>least<seq2seq4repair_space>one<seq2seq4repair_space>file" ) ) ; } } } }

Fix:
String testPath = ( JMeterUtils . getJMeterHome ( ) ) + "//build" ;